Since you got stud mount I would go with the crane gold race rockers. My cobras have a little play back and fourth buts it's only 1/2 of a mm. but the noise is a pain in the a#$. :evil:

 

Side 2 side is normal(NOTE:it is a ROCKER-not rigid), unless under load(Valve open)

 

The pedestal mount rockers shouldn't have any side-to-side play should they? If they did wouldn't it have to be in the bearing itself, since the trunnion is bolted down solid? The slop in the pushrod groove of the guide plate would allow the stud mounted rocker to move a little wouldn't it? I assume there shouldn't be much slop with either kind. It does seem like guys complain about stud mount rockers being noisier than the pedestal mount. I guess bad geometry can make them noisy as well. Good Luck!

 

The side to side play is normal. I have it on mine and mine are quiet. its just the clearance between the pushrod and the guide plate. As long as u put it to zero lash and do a half turn it should be perfect. I thought too much into and and couldnt get em right. Just set em to zero lash and put a half turn on em and you should be fine. Mine are nice and quiet.

 

yep its normal. thats why there are snap rings to keep them from sliding apart

 

My Comp Pro-Magnums have side to side play. Brand new rockers. A couple are really noisy at idle. I tried 3 times adjusting them and still no better. I might try running a thicker oil.

 

The side to side play is normal. I have it on mine and mine are quiet. its just the clearance between the pushrod and the guide plate. As long as u put it to zero lash and do a half turn it should be perfect. I thought too much into and and couldnt get em right. Just set em to zero lash and put a half turn on em and you should be fine. Mine are nice and quiet.

Did everybody miss this post? This is correct. The rockers can move side to side because of the difference in the opening of the guide plate and the diameter of the pushrod. This is what guideplates are for, to keep the pushrod even with the roller tip.